Code No. B1643 Rear detect sensor communication error
Code No. B1644 Rear detect sensor communication impossible










OPERATION



TROUBLE JUDGEMENT



PROBABLE CAUSES



  • Malfunction of the rear detect sensor
  • Damaged harness wires and connectors
  • Malfunction of SRS-ECU

DIAGNOSIS PROCEDURE

STEP 1. Check C-114 wiring harness between the rear detect sensor connector terminal No. 1, 2 and B-113 SRS-ECU connector terminal No. 12, 11.

  • Check the rear detect sensor output line for open circuit and short circuit.

Q. Is the check result normal?
Replace the rear detect sensor.(Refer to ) Then proceed to step 2.
Repair the wiring harness.

STEP 2. Diagnosis code recheck

Q. Is No. B1643 or B1644 set?
Replace the SRS-ECU.(Refer to .)
Intermittent malfunction. (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunction .)